| Merthyr Tudful to Cuenca | 808.88 mi (1,301.77 km) |
| Merthyr Tudful to Cuevas del Almanzora | 1,000.63 mi (1,610.36 km) |
| Merthyr Tudful to Cullera | 882.02 mi (1,419.48 km) |
| Merthyr Tudful to Culleredo | 628.86 mi (1,012.05 km) |
| Merthyr Tudful to Cunit | 766.20 mi (1,233.08 km) |
| Merthyr Tudful to Daganzo de Arriba | 773.83 mi (1,245.36 km) |
| Merthyr Tudful to Daimiel | 874.78 mi (1,407.82 km) |
| Merthyr Tudful to Don Benito | 891.65 mi (1,434.98 km) |
| Merthyr Tudful to Donostia | 585.59 mi (942.41 km) |
| Merthyr Tudful to Dos Hermanas | 1,006.72 mi (1,620.16 km) |
| Merthyr Tudful to Durango | 593.43 mi (955.04 km) |
| Merthyr Tudful to Ecija | 985.30 mi (1,585.68 km) |
| Merthyr Tudful to Ejea de los Caballeros | 672.52 mi (1,082.32 km) |
| Merthyr Tudful to El Alamo | 795.97 mi (1,280.99 km) |
| Merthyr Tudful to El Arahal | 1,005.81 mi (1,618.69 km) |
